using System;
using System.IO;
using System.Threading.Tasks;
using Minio;
using Minio.DataModel;
using Minio.DataModel.Args;

namespace Hopetry.Services
{
    public static class UploadHelper
    {
        /// <summary>
        /// 带重试机制的安全文件上传
        /// </summary>
        /// <param name="client">MinIO客户端</param>
        /// <param name="bucketName">存储桶名称</param>
        /// <param name="filePath">本地文件路径</param>
        /// <param name="objectName">对象名称</param>
        /// <param name="progressCallback">进度回调</param>
        /// <returns>上传是否成功</returns>
        public static async Task<bool> SafeUploadFileAsync(
            IMinioClient client, 
            string bucketName, 
            string filePath, 
            string objectName, 
            IProgress<ProgressReport> progressCallback = null)
        {
            // 验证输入参数
            if (string.IsNullOrWhiteSpace(bucketName) || string.IsNullOrWhiteSpace(filePath) || string.IsNullOrWhiteSpace(objectName))
            {
                Console.WriteLine("上传参数验证失败");
                return false;
            }

            // 检查文件是否存在
            if (!File.Exists(filePath))
            {
                Console.WriteLine($"文件不存在: {filePath}");
                return false;
            }

            try
            {
                var putObjectArgs = new PutObjectArgs()
                    .WithBucket(bucketName)
                    .WithObject(objectName)
                    .WithFileName(filePath)
                    .WithProgress(progressCallback);

                await client.PutObjectAsync(putObjectArgs);
                return true; // 上传成功
            }
            catch (Exception ex)
            {
                Console.WriteLine($"上传失败: {ex.Message}");
                return false; // 让调用方决定是否重试
            }
        }
        
        /// <summary>
        /// 检查文件是否已存在于MinIO中
        /// </summary>
        /// <param name="client">MinIO客户端</param>
        /// <param name="bucketName">存储桶名称</param>
        /// <param name="objectName">对象名称</param>
        /// <returns>文件是否存在</returns>
        public static async Task<bool> CheckFileExistsAsync(IMinioClient client, string bucketName, string objectName)
        {
            try
            {
                var args = new StatObjectArgs()
                    .WithBucket(bucketName)
                    .WithObject(objectName);
                
                var stat = await client.StatObjectAsync(args);
                return true;
            }
            catch (Exception)
            {
                // 文件不存在或无法访问
                return false;
            }
        }
    }
}